Crop a picture in C# with the use of rectangle box

Question

I want to crop a pic in c#. As in most photo editing softwares i want to use the rectangle box which can be resize and move with mouse(as in most image editing softwares).

plz also tell that how it is possible that the pic inside the rectangle is bright while outside is darker. following pic give the some idea........

http://img3.imageshack.us/img3/2286/cropcvi.jpg

I also need a way which is fast and best.plz help me to give any idea.

Thanks in advance.

Answer 1

The outside of the selection box seems to have a black image laid over it with a alpha of about 30%. To do this you would just take each pixel outside of the content area and draw a black pixel with a 30% alpha on top of it. This would give the desired dimmed out effect.

As for how you can get a rectangle to be dynamically seizable in C#.

Answer 2

(My answer assumes a web application using ASP.NET):

You probably needs some javascript library to get the dimensions of the pic to crop. This jQuery plugin will do the trick:

http://www.webresourcesdepot.com/jquery-image-crop-plugin-jcrop/

Then here's an article on Stack Overflow that shows how to crop the image:

http://stackoverflow.com/questions/734930/how-to-crop-an-image-using-c

Answer 3

In order to draw a picture lighter or darker (or alter the colors in any way) you use a ColorMatrix, like this.

Answer 4

Check this out:

http://www.codeproject.com/KB/WPF/CropAdorner.aspx